Step 1

Grease an 8x8 pan with butter, set aside.

Step 3

In a large non-stick pan, melt butter over medium-high heat. Once melted add 1 and 1/2 bags of marshmallows, stirring until marshmallows melt completely. Stir in vanilla extract.

Step 5

Remove from heat and quickly fold in ritz. Stir in remaining 1/2 bag of marshmallows and then fold in the rolos as fast as you can. I poured 75% of them in and did one quick fold (saving the rest for pressing into the top for decoration). Transfer mixture to prepared pan and spread evenly using a buttered spatula. If you saved any rolos, press them into the top of the marshmallow treats now.

Step 7

Allow to cool completely. You can speed up this process by cooling them in the refrigerator. When cooled, cut into squares and serve immediately or store in an airtight container for up to a week.